I always thought the creepiest ones are the ones who stare at you through windows. It's an odd fear, but stuff through windows tends to top my lists.
I tend to surround myself with sentimental objects. I'm able to convince myself that these things (usually some gift that a friend gave me, one which was particularly meaningful) have a sort of positive influence that can deal with such creatures. Failing that, I just watch this video and thereafter have faith that Christopher Walken will protect me.